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Simrad IS12 Combi water temperature fix

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SamsonII View Drop Down
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    Posted: 27 June 2017 at 20:37
Hi,

Since I bought the boat the Simrad IS12 Combi has been showing water temperature to be --.  In my previous boat with Raymarine ST60 instruments I had the same problem - as many other Raymarine and Simrad owners. The fault is the 10 kohm thermistor in the Airmar speed/temp sensor.

There are two fixes to the problem - one cheap and one expensive! The expensive is to replace the Airmar ST300 sensor. The cheap is what I will describe below (and what many other Raymarine/Simrad owners have done already).

1. Buy a 10 kohm NTC thermistor. In Norway this can be done from Elfa Distrelec for under 10 NOK
2. Split the cable from the Airmar speed/temp sensor under the floor in the front cabin (picture 2)
3. Cut the brown and the white wire
4. Solder some wire to the thermistor and solder it between the white and brown wire (Picture 1)
5. Mix some epoxy and glue the thermistor to the bottom of the hull (Picture 3)

Ok - it will give you a missreading of 1-2 degrees celcius, but I can live with that. IS12 does not have an option to calibrate the sea temp. Raymarine has this feature, and you can get it 100% correct.

See pictures:

Picture 1: Thermistor soldered to a piece of wire


Picture 2: White and brown wire cut from the split cable


Picture 3: The sensor glued to the hull with epoxy

Stein-Erik Carlsen

Hanse 370e 2006 #41 "Samson II"
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Bernstein View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bernstein Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2017 at 12:29
Hi Samson,ClapClapClap

i am very happy! Have the same Problem. Bought today on ebay  a 10 kohm NTC thermistor and will repair it this weekend.
Thank you for your posting.

Greetings from the east side of baltic sea!

Bernstein
Bernstein, Hanse 320, 2008, Ostsee
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Mark&Catherine View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mark&Catherine Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2017 at 13:40
Mine doesn't show --, it just disappeared all together, on data sources there are no temperature values to select, and on the instrument diagnostics the data simply does not appear on the list with speed and depth??.?.?..
385 ubulukutu sail number GBR 3350L in Turkey and Greece with Mark and Catherine
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High Time View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote High Time Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2017 at 17:03
Mark

I think you will have NMEA2000 (digital) sensors on your 385, the same as on High Time. The speed/depth sensor plugs straight into the Simnet.

The one referred to above is (I think) analogue with separate wires for the temperature sensor (thermistor) as described.
Roger

High Time (415 #038)
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Rubato View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rubato Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2017 at 17:21
Cool, thanks!

Steve

Hanse 400e, #168
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SamsonII View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote SamsonII Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2017 at 17:59
Hi,

And after testing today (the epoxy has cured) I can confirm SUCCESS!

On the IS12 Combi I get 20 degrees celcius.  


On my CP31 there is an option to calibrate the temperature - and here I have set -3 degrees offset (to be on the safe side - I hate to jump into cold water! Measured temp at the boat is 18,5 actually)

Stein-Erik Carlsen

Hanse 370e 2006 #41 "Samson II"
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Forth2 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Forth2 Quote  Post ReplyReply Direct Link To This Post Posted: 29 June 2017 at 08:44
I just soldered a Fixed 11 Kohm resistor in place of the NTC.
So I am always sailing in warm waters Wink +23C. Warm for the Baltic at least.

The reason was that the Raymarine ITC-5 otherwise refuses to understand that a speed sensor is online !



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